Vortex-induced rectification in type II superconductors |
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Authors: | Xiuguang Jiang C J Lobb |
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Affiliation: | (1) Center for Superconductivity Research, Department of Physics, University of Maryland, 20742 College Park, Maryland |
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Abstract: | We report a large rectification effect in superconducting films in a parallel magnetic field. This rectification effect is manifested in two features in current-voltage characteristics: The critical current, Ic,is found to differ by as much as 40% for negative and positive currents, and beyond Ic,the magnitude of the voltage is different for positive and negative currents, ¦V(+I)¦ ¦V(–I)¦.Furthermore, the critical current difference ¦Ic+¦ – ¦Ic–¦shows complicated behavior, changing sign as temperature and magnetic field are varied. We discuss a model based on the Bean-Livingston surface barrier and inhomogeneous bulk pinning that accounts for all observed behavior. |
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